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Home >> Nissan-Datsun >> 2019 >> Altima Edition ONE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Control System (DTC/Circuit Diagnosis) (Pr25DD) (1 Of 4)) >> DTC/Circuit Diagnosis >> P0128 Thermostat Function >> DTC Description >> PR25DD engine >> DTC Confirmation Procedure

DTC Confirmation Procedure

WARNING: This page is about a different variant/trim than selected.
NOTE: Never refuel before and during the following procedure.
  1. CHECK DTC PRIORITY 

    If DTC P0128 is displayed with DTC P0300, P0301, P0302, P0303 or P0304, first perform the trouble diagnosis for P0300, P0301, P0302, P0303 or P0304.

    Is applicable DTC detected?

    YES

    Perform diagnosis of applicable. Refer to DTC Index .

    NO

    GO TO 2.

  2. PRECONDITIONING-1 

    If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Turn ignition switch ON.
    3. Turn ignition switch OFF and wait at least 10 seconds.

    GO TO 3.

  3. PRECONDITIONING-2 

    SYMBOL With CONSULT

    1. Turn ignition switch ON.
    2. Check the following conditions:

      Ambient temperature

      -10 deg. C (14 deg. F) or more

      A/C switch

      OFF

      Blower fan switch

      OFF
    3. Select "DATA MONITOR" mode of "ENGINE" using CONSULT.
    4. Check the following conditions:

      COOLAN TEMP/S

      -10 deg. C - 58 deg. C (14 - 136 deg. F)

    Is the condition satisfied?

    YES

    GO TO 4.

    NO

    1. Satisfy the condition.
    2. GO TO 4.
  4. PERFORM DTC CONFIRMATION PROCEDURE-1 

    SYMBOL With CONSULT

    1. Start engine.
    2. Drive the vehicle until the following condition is satisfied.
      CAUTION: Always drive vehicle at safe speed.
      1. STEP 1

        Drive the vehicle under the conditions instructed below until the difference between "COOLAN TEMP/S" and "FUEL T/TMP SE" becomes at least 26 deg. C (47 deg. F).

        COOLAN TEMP/S

        66 deg. C (151 deg. F) or less

        FUEL T/TMP SE

        Less than the value calculated by subtracting 26 deg. C (47 deg. F) from "COOLAN TEMP/S".*
        *: Example

        COOLAN TEMP/S

        FUEL T/TMP SE

        70 deg. C (158 deg. F)

        44 deg. C (111 deg. F) or less

        65 deg. C (149 deg. F)

        39 deg. C (102 deg. F) or less

        60 deg. C (140 deg. F)

        34 deg. C (93 deg. F) or less
      2. STEP 2

        Drive the vehicle at 50 km/h (32 MPH) or more with the difference between "COOLAN TEMP/S" and "FUEL T/TMP SE" maintained at 26 deg. C (47 deg. F) or more.

        NOTE: Keep the accelerator pedal as steady as possible during cruising.
      3. STEP 3

        Drive the vehicle at 50 km/h (32 MPH) or more until "COOLAN TEMP/S" increases by 6 deg. C (11 deg. F).

        NOTE: Keep the accelerator pedal as steady as possible during cruising.

    Is the condition satisfied?

    YES

    GO TO 5.

    NO

    GO TO 2.

  5. PERFORM DTC CONFIRMATION PROCEDURE-2 

    SYMBOL With CONSULT

    1. Drive the vehicle until the following condition is satisfied.

      COOLAN TEMP/S

      67 deg. C (153 deg. F) or more
      CAUTION: Always drive vehicle at safe speed.
    2. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES

    Proceed to DTC Diagnosis Procedure 

    NO

    INSPECTION END

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